0000000000460036

AUTHOR

Paolo Preziosi

showing 5 related works from this author

Presynaptic effects of anandamide and WIN55,212-2 on glutamatergic nerve endings isolated from rat hippocampus

2006

We examined the effects of the endocannabinoide-anandamide (AEA), the synthetic cannabinoid, WIN55,212-2, and the active phorbol ester, 4-beta-phorbol 12-myristate 13-acetate (4-beta-PMA), on the release of [(3)H]d-Aspartate ([(3)H]d-ASP) from rat hippocampal synaptosomes. Release was evoked with three different stimuli: (1) KCl-induced membrane depolarization, which activates voltage-dependent Ca(2+) channels and causes limited neurotransmitter exocytosis, presumably from ready-releasable vesicles docked in the active zone; (2) exposure to the Ca(2+) ionophore-A23187, which causes more extensive transmitter release, presumably from intracellular reserve vesicles; and (3) K(+) channel block…

MaleSettore BIO/14 - FARMACOLOGIAPolyunsaturated AlkamideshippocampusMorpholinesmedicine.medical_treatmentPresynaptic TerminalsArachidonic AcidsNaphthalenesExocytosisCellular and Molecular Neurosciencechemistry.chemical_compoundGlutamatesglutamate releasemedicineAnimalsanandamideActive zoneRats WistarNeurotransmitterCannabinoidCalcimycinProtein kinase CSynaptosomeArachidonic AcidChemistrysynaptosomesDepolarizationCell BiologyAnandamideHippocampal synaptosomeCalcium Channel BlockersBenzoxazinesRatsBiochemistryBiophysicsTetradecanoylphorbol AcetateCannabinoidCapsaicinEndocannabinoidsNeurochemistry International
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Evidence for the neuronal origin of immunoreactive interleukin-1 beta released by rat hypothalamic explants.

1996

In this study, we have investigated the release of immunoreactive interleukin-1 beta (irIL-1 beta) from the rat hypothalamus in vitro. It was found that (1) tissue explants release sizable amounts of irIL-1 beta (ranging from 0.43 to 0.52 pg/mg of wet tissue) in 20 min incubations; (2) basal release in significantly increased by depolarization induced with 56 mM KCl; (3) K(+)-induced irIL-1 beta release is inhibited by the specific blocker of N-type calcium channels, omega-conotoxin, and by verapamil, but not by nifedipine; (4) K(+)-induced release is also inhibited by the Na+ channel blockers tetrodotoxin and lidocaine; (5) irIL-1 beta release is significantly increased by noradrenalin; su…

Malemedicine.medical_specialtyHypothalamusRadioimmunoassaychemistry.chemical_elementPropranololCalciumIn Vitro TechniquesPotassium ChlorideNorepinephrinePhentolamineNifedipineInternal medicinemedicineAnimalsChannel blockerRats WistarNeuronsVoltage-dependent calcium channelGeneral NeuroscienceDepolarizationCalcium Channel BlockersRatsElectrophysiologyEndocrinologychemistryVerapamilmedicine.drugInterleukin-1Sodium Channel BlockersNeuroscience letters
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Neurosteroid modulation of the presynaptic NMDA receptors regulating hippocampal noradrenaline release in normal rats and those exposed prenatally to…

2003

Abstract Prenatal exposure to diazepam (DZ), a positive allosteric modulator of the γ-aminobutyric acidA (GABAA) receptor complex, exerts profound effects that become more evident during puberty and in many cases are sex-specific, suggesting that such exposure interferes with the activity of steroid hormones. Apart from their well known effects on the genome, the reduced metabolites of many steroid hormones also interact directly with membrane receptors, including those for N-methyl- d -aspartate (NMDA). In this study, we compared the effects of several neurosteroids on NMDA receptors from normal rats and those exposed in utero to DZ (1.25 mg/kg per day) from the 14th through the 20th day o…

MalePregnenolone sulfatemedicine.medical_specialtyReceptor complexNeuroactive steroidAllosteric modulatorGlycinePharmacologyHippocampusReceptors N-Methyl-D-AspartateNorepinephrineCellular and Molecular Neurosciencechemistry.chemical_compoundPregnancyInternal medicineNeurosteroidmedicinepregnenolone sulphateAnimalsRats WistarReceptorDiazepamGABAA receptorHippocampal synaptosomesCell BiologyRatsEndocrinologyNMDA/GLY-mediated [3H]NA releasechemistryPregnenolonePrenatal Exposure Delayed EffectsSettore BIO/14 - FarmacologiaNMDA receptorFemalePregnenolone sulfateSynaptosomesHormoneNeurochemistry International
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Inhibition by Anandamide and Synthetic Cannabimimetics of the Release of [3H]d-Aspartate and [3H]GABA from Synaptosomes Isolated from the Rat Hippoca…

2004

Cannabinoids (CB) can act as retrograde synaptic mediators of depolarization-induced suppression of inhibition or excitation in hippocampus. This mechanism may underlie the impairment of some cognitive processes produced by these compounds, including short-term memory formation in the hippocampus. In this study, we investigated several compounds known to interact with CB receptors, evaluating their effects on K +-evoked release of [ 3H]d-aspartate ([ 3H]d-ASP) and [ 3H]GABA from superfused synaptosomes isolated from the rat hippocampus. [ 3H]d-ASP and [ 3H]GABA release were inhibited to different degrees by the synthetic cannabinoids WIN 55,212-2; CP 55,940, and arachidonyl-2′- chloroethyla…

MaleCannabinoid receptorSettore BIO/14 - FARMACOLOGIAPolyunsaturated Alkamidesmedicine.medical_treatmentHippocampusArachidonic AcidsPharmacologyHippocampal formationDepolarization-induced suppression of inhibitionHippocampusBiochemistryCellular and Molecular Neurosciencechemistry.chemical_compoundglutamate releasemedicineAnimalsRats WistarCannabinoidgamma-Aminobutyric AcidCannabinoid Receptor AgonistsAspartic AcidCannabinoidsChemistryGeneral MedicineAnandamideCyclohexanolsgaba releaseEndocannabinoid systemRatsKineticsnervous systemBiochemistryAnimals Arachidonic Acids Aspartic Acid Calcium Cannabinoids Capsaicin Cyclohexanols gamma-Aminobutyric Acid Hippocampus Kinetics Polyunsaturated Alkamides Potassium Rats Receptors Cannabinoid SynaptosomesPotassiumCalciumlipids (amino acids peptides and proteins)CannabinoidCapsaicinCapsazepineEndocannabinoidsSynaptosomesNeurochemical Research
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Prenatal diazepam exposure functionally alters the GABA(A) receptor that modulates [3H]noradrenaline release from rat hippocampal synaptosomes.

2002

In rats, exposure to diazepam (DZ) during the last week of gestation is associated with behavioral alterations (in some cases sexually dimorphic) that appear when the animals reach adulthood. This study was conducted to evaluate the effects of prenatal DZ exposure on the function of the gamma-aminobutyric (GABA)(A) receptor complex. The method used - perfusion of rat hippocampal nerve terminals labeled with [3H]noradrenaline (NA) - allowed us to evaluate the effects of DZ on a specific native GABA(A) receptor subtype which is located on hippocampal noradrenergic nerve endings and mediates the release of NA. Muscimol stimulated synaptosomal release of [3H]NA in a concentration-dependent mann…

Fetal ProteinsMaleBaclofenNerve Tissue ProteinsPregnanoloneBicucullinein uteroHippocampusGABA AntagonistsNorepinephrineAllosteric RegulationPregnancyAnimalsPicrotoxinRats WistarGABA AgonistsDiazepam In utero [3H]Noradrenaline release Synaptosomes GABAA receptor Allosteric modulationallosteric modulationDiazepamMental DisordersGABAA receptorReceptors GABA-ARatsProtein SubunitsPrenatal Exposure Delayed EffectsSettore BIO/14 - FarmacologiaFemaleSynaptosomesDevelopmental neuroscience
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